GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Speedo off at high speeds?

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Old Mar 7, 2009 | 10:33 PM
  #11  
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with 4.11's?
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Old Mar 7, 2009 | 10:35 PM
  #12  
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When DozerDan and I make a run to mexicio I may have him hold my GPS and see... If he's wiling
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Old Mar 7, 2009 | 10:40 PM
  #13  
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4.10's 255/50/20
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Old Mar 7, 2009 | 11:08 PM
  #14  
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Corrected the Original post. 135 is what the Calc says. not 147. Failed to adjust the tire height when I checked it again.

Andrews is about right. the calc says 137.4 for his
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Old Mar 8, 2009 | 05:35 AM
  #15  
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at . . 135mph / 63XXX rpm . .my shaft =
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Old Mar 8, 2009 | 05:45 AM
  #16  
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I moved my gps where I could see it better and checked it. It's right.
Took it up to 130 but didn't have the laptop hooked up to it.

I have a 2 piece driveshaft.
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Old Mar 8, 2009 | 09:30 AM
  #17  
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theres no need for you to go 130
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Old Mar 8, 2009 | 07:16 PM
  #18  
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I know. But it happened.
Don't expect it to happen again unless i'm running from an asteroid or something
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